[ncl-talk] Accessing Variables in NAM file

[Guido Cioni]

Barry,
[1] this is NOT a forum designed to help you with general issues: for this you have to read the documentation and the starter guide. Most of your issues can be easily solved if you spend some time researching on your own, especially if you are new to NCL.

[2] Sending multiple email at 1 hour distance for every issue that arises doesn't help. We try to help each other and we can not do that if we are overwhelmed by requests from the same user. 

[3] It is not clear what you are trying to do. Presumably you want to plot the pressure at mean sea level height (PRMSL) in NCL by defining a variable MY_PRES in NCL. In this case the correct syntax is MY_PRES=nc_file->PRMSL. If you use "@" you are trying to overwrite the attribute PRMSL_218_MSL of the variable nc_file which, of course, doesn't make any sense. 

It seems to me that you didn't follow one of the multiple guides available on the website (http://www.ncl.ucar.edu/Document/ <http://www.ncl.ucar.edu/Document/>). Please, try to do that before writing again to ncl-talk.

Good luck

Guido Cioni
http://guidocioni.altervista <http://guidocioni.altervista/>.org

> On 21 Nov 2016, at 16:34, Barry Lynn <barry.h.lynn at gmail.com> wrote:
> 
> Hi:
> 
> I am trying to access the variables within the nam file I uploaded a bit earlier.
> 
> I used g1print.exe from WPS to make a list of the variables.
> 
> rec GRIB GRIB  Lvl  Lvl  Lvl         Time      Fcst
>  Num Code name  Code one  two                   hour
> ----------------------------------------------------
>    1 130 MSLET  102    0    0  2013-02-08_00:00 + 00
>    2   2 PRMSL  102    0    0  2013-02-08_00:00 + 00
>    
> I also did a print a and saw:
> 
> PRMSL_218_MSL
> 
> MY_PRES = nc_file at PRMSL_218_MSL
> 
> No matter if I use "PRMSL" by itself or as is, I get this warning and null print.
> 
> warning:Attempt to reference attribute (PRMSL_218_MSL) which is undefined
> (0)	MY_PRES-2147483647
> 
> Thank you for your help in decoding the NAM data.
> 
> Barry
> P.S. I also have additional warning, but I don't think they are refevant.
> 
> warning:NclGRIB: Unknown grib parameter number detected (240, center 7, table version 129 grib record 388), using default variable name (VAR_240)
> 
> -- 
> Barry H. Lynn, Ph.D
> Senior Lecturer,
> The Institute of the Earth Science, 
> The Hebrew University of Jerusalem, 
> Givat Ram, Jerusalem 91904, Israel 
> Tel: 972 547 231 170
> Fax: (972)-25662581
> 
> C.E.O, Weather It Is, LTD
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